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Phase transitions in solid solutions of strontium titanate with titanates of the divalent metals Pb, Ba, and Ca are considered. It is shown that the critical concentration x c in the well-known expression relating the transition temperature to the polar state in SrTiO 3 with the concentration x of divalent metals, T c = A ( x − x c ) 1/2 , is practically the same for all impurities. For large values of x , the ferroelectric transition temperature T c depends linearly on x . The volume and impurity contributions to the T c ( x ) relation are determined for this concentration range.
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Vladislav V Lemanov (1997) studied this question.
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